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authorMike Christie <michaelc@cs.wisc.edu>2006-08-31 18:09:33 -0400
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-09-02 13:37:36 -0500
commitf47f2cf5d4acf929a3aaa6957c3fc4622c358703 (patch)
tree6bf770ac6a789f926728b1881a7eee64a463404f /drivers/scsi/libiscsi.c
parentca5186842a6d85e982e3d572ecd407453d0c5116 (diff)
[SCSI] libiscsi: check that command ptr is set before accessing it
If the scsi eh sends a TUR and the session is down we could return SCSI_ML_HOST_BUSY. scsi eh will ignore this and send ask us to abort the command and we blindly accesst the command ptr. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/libiscsi.c')
-rw-r--r--drivers/scsi/libiscsi.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 864c6284e83..12b5c180074 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -192,6 +192,8 @@ static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
ctask->state = ISCSI_TASK_COMPLETED;
ctask->sc = NULL;
+ /* SCSI eh reuses commands to verify us */
+ sc->SCp.ptr = NULL;
list_del_init(&ctask->running);
__kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
sc->scsi_done(sc);
@@ -737,6 +739,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
sc->scsi_done = done;
sc->result = 0;
+ sc->SCp.ptr = NULL;
host = sc->device->host;
session = iscsi_hostdata(host->hostdata);
@@ -801,9 +804,10 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
list_add_tail(&ctask->running, &conn->xmitqueue);
debug_scsi(
- "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
+ "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
+ "win %d]\n",
sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
- conn->id, (long)sc, ctask->itt, sc->request_bufflen,
+ conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
spin_unlock(&session->lock);
@@ -1134,11 +1138,24 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
int iscsi_eh_abort(struct scsi_cmnd *sc)
{
- struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_session *session = conn->session;
+ struct iscsi_cmd_task *ctask;
+ struct iscsi_conn *conn;
+ struct iscsi_session *session;
int rc;
+ /*
+ * if session was ISCSI_STATE_IN_RECOVERY then we may not have
+ * got the command.
+ */
+ if (!sc->SCp.ptr) {
+ debug_scsi("sc never reached iscsi layer or it completed.\n");
+ return SUCCESS;
+ }
+
+ ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
+ conn = ctask->conn;
+ session = conn->session;
+
conn->eh_abort_cnt++;
debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);